LeadHaste Leveraged Smartlead to Achieve $100K Revenue in 9 Months, 30% Reply Rates, and 80% Positive Response For Their Clients

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Client Background
Dimitar Petkov transitioned from solo freelancer using simple email tools to head of LeadHaste, an agency specializing in scaling deeply personalized B2B outbound campaigns. Initially limited by manual tools which lacked API support, efficient multi-inbox scaling, and robust deliverability—Dimitar sought industry-grade solutions that could help his clients grow beyond browser extension limitations, reliably reach prospects, and automate internal operations.
Challenges
- Early tools couldn’t expand past a handful of inboxes, limiting client campaign scope.
- Manual setup and lack of pre-campaign checks led to high bounce rates and inconsistent sender reputation.
- No bulk reporting, global block listing, or automated workflow/notifications meant lost opportunities and inefficiency.
- No API connections to integrate reporting, notifications, and CRM with operational platforms like Airtable, ClickUp, or client CRMs.
Solutions & Approach
LeadHaste adopted Smartlead to overhaul its outbound infrastructure.
Multi-Inbox Scaling
Leveraged Smartlead’s reseller and vendor tools to onboard hundreds—sometimes thousands—of inboxes at once, eliminating bottlenecks and saving immense setup time.
Smart Deliverability
Used SmartServers, campaign-level and domain throttling, and advanced pre-send deliverability tests to ensure high inbox placement.

API Automation
Connected Smartlead with ClickUp and Airtable, automating notifications, client reporting, blocklists, and campaign health, allowing the agency to operate lean and scale fast.
Master Inbox & Analytics
Used master inbox features to unify client engagement, and new analytics dashboards to rapidly assess campaign performance, date ranges, and reply health percentages.
Continuous Improvement
Benefited from Smartlead’s regular product updates, new features for data handling, email campaign diagnosis, and mailbox issue insights—constantly adapting to shifting industry standards.
Data Enrichment & Personalization Strategy
- Deep Scraping: Used Apollo and Google Maps scraping (via N8n, Serper) and browser extensions like Instant Data Scraper to build ultra-precise lead lists for each campaign.
- Multi-Tool Verification: Enriched leads via Clay, Xenero, and custom API integrations, verifying emails, adding firmographics, and customizing each email sequence.
- Hyper-Personalization: Each email was relevant, non-generic, and crafted to drive engagement—avoiding robotic outreach.
Campaign Results
HelpMatch (Client-Verified)
- From zero to $100k revenue in 9 months with Smartlead-powered campaigns.
- Averaged 1,500 buyer conversations per month, 28% reply rate, and 80% positive reply rate.
- Achieved $100k closed pipeline by month 9.
Aviloo (Battery Diagnostics, EU/Global Expansion)
- Overcame fragmented EU cold outreach with localized, multi-language sequences.
- Generated 50+ in-person meetings, 500+ positive replies, and 20+ confirmed new sales.
- SDR team freed to focus on top prospects, not just manual prospecting.
Tribecast (YouTube Influencer Channel Deals)
- Automated outreach for premium influencer deals, targeting channels with 2M+ downloads.
- Netted 400+ positive replies, 4.7% reply rate, and 32% positive reply rate.
- Mass outbound became feasible through creator-specific campaign engines and fast iteration cycles.
Typical LeadHaste Campaign Metrics
- Campaigns routinely ran to over 10,000 leads at a time.
- Recent HelpMatch launch delivered 10,800 leads, 3,200 replies (30% reply rate), and 2,500 positive replies (80% positive rate), with bounce rates under 2%—well above industry average.
Technical Advantages
Deliverability Management
Campaign setup included SmartServer assignment, deliverability tests, inbox health checks, and global analytics. Reply detection, bounce management, and mailbox issue flags protected sender reputation.
API Flexibility
Allowed custom CRM notifications, reminders, and reporting. Manual steps like data export, blocklisting, and response monitoring became automated.
Feature Velocity
Smartlead released major new features—like domain throttling, master inboxes, extended analytics—nearly every week, keeping LeadHaste on the industry’s leading edge.
Future Needs From Smartlead
- The agency seeks deeper CRM workflow—more robust reminders, automated deal stage triggers, and easier notification setups.
- New vendor integrations and mailbox management enhancements continually strengthen LeadHaste’s ability to add clients and launch new verticals.
- Dimitar noted the value of being able to easily export campaign data for use in enrichment/personalization tools like Clay.
Lessons Learned
- Even the best offers will be wasted if emails don’t reach inboxes—an area Smartlead excels at solving.
- API access allowed LeadHaste to scale efficiently, maintain data quality, and reduce operational overhead.
- Smartlead’s frequent product releases mean agencies like LeadHaste can stay ahead of changes in deliverability, compliance, and market tactics.
- Targeted, custom outreach proved critical, shown by reply rates far exceeding generic approaches.
Conclusion
LeadHaste’s transformation into a scalable outbound powerhouse was fueled by Smartlead’s advanced deliverability controls, API-driven automation, rapid feature development, and hyper-personalized campaign management.
These tools enabled the agency to go from a few inboxes to thousands, support multi-market growth, and achieve exceptional response, reply, and conversion metrics—including scaling HelpMatch from zero to $100k in less than a year.
LeadHaste continues to thrive by pairing data and human insight with leading-edge automation—delivering real, measurable results for clients in Europe, North America, and beyond.
Your business can achieve similar results with Smartlead. All you have to do is check out our 14-day trial and see how it can transfer your cold email outreach.

Author’s Details

Wajahat Ali
Wajahat Ali is a Technical Content Writer at Smartlead, specializing in the B2B and SaaS sectors. With a talent for simplifying complex concepts, he crafts clear, engaging content that makes intricate topics accessible to both experts and newcomers. Wajahat’s expertise spans across copywriting, social media content, and lead generation, where he consistently delivers valuable, impactful content that resonates with a global audience. His ability to blend technical knowledge with compelling storytelling ensures that every piece of content drives both understanding and results, helping businesses connect with their target markets effectively.
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Frequently asked questions
What is Smartlead's cold email outreach software?
Smartlead's cold email outreach tool helps businesses scale their outreach efforts seamlessly. With unlimited mailboxes, fully automated email warmup functionality, a multi-channel infrastructure, and a user-friendly unibox, it empowers users to manage their entire revenue cycle in one place. Whether you're looking to streamline cold email campaigns with automated email warmups, personalization fields, automated mailbox rotation, easy integrations, and spintax, improve productivity, or enhance scalability with subsequences based on lead’s intentions, automated replies, and full white-label experience, our cold email tool implifies it in a single solution.
What is Smartlead, and how can it enhance my cold email campaigns?
Smartlead is a robust cold emailing software designed to transform cold emails into reliable revenue streams. Trusted by over 31,000 businesses, Smartlead excels in email deliverability, lead generation, cold email automation, and sales outreach. A unified master inbox streamlines communication management, while built-in email verification reduces bounce rates.
Additionally, Smartlead offers essential tools such as CNAME, SPF Checker, DMARC Checker, Email Verifier, Blacklist Check Tool, and Email Bounce Rate Calculator for optimizing email performance.
How does Smartlead's unlimited mailboxes feature benefit me?
Our "unlimited mailboxes" feature allows you to expand your email communications without restrictions imposed by a mailbox limit. This means you won't be constrained by artificial caps on the number of mailboxes you can connect and use. This feature makes Smartlead the best cold email software and empowers you to reach a wider audience, engage with more potential customers, and manage diverse email campaigns effectively.
How does Smartlead, as a cold emailing tool, automate the cold email process?
Smartlead’s robust cold email API and automation infrastructure streamline outbound communication by transforming the campaign creation and management processes. It seamlessly integrates data across software systems using APIs and webhooks, adjusts settings, and leverages AI for personalised content.
The cold emailing tool categorises lead intent, offers comprehensive email management with automated notifications, and integrates smoothly with CRMs like Zapier, Make, N8N, HubSpot, Salesforce, and Pipedrive. Smartlead supports scalable outreach by rapidly adding mailboxes and drip-feeding leads into active campaigns Sign Up Now!
What do you mean by "unibox to handle your entire revenue cycle"?
The "unibox" is one of the unique features of Smartlead cold email outreach tool, and it's a game-changer when it comes to managing your revenue cycle. The master inbox or the unibox consolidates all your outreach channels, responses, sales follow-ups, and conversions into one centralized, user-friendly mailbox.
With the "unibox," you gain the ability to:
1. Focus on closing deals: You can now say goodbye to the hassle of logging into multiple mailboxes to search for replies. The "unibox" streamlines your sales communication, allowing you to focus on what matters most—closing deals.
2. Centralized lead management: All your leads are managed from one central location, simplifying lead tracking and response management. This ensures you take advantage of every opportunity and efficiently engage with your prospects.
3. Maintain context: The "unibox" provides a 360-degree view of all your customer messages, allowing you to maintain context and deliver more personalized and effective responses.
How does Smartlead ensure my emails don't land in the spam folder?
Smartlead, the best cold email marketing tool, ensures your emails reach the intended recipients' primary inbox rather than the spam folder.
Here's how it works:
1. Our "unlimited warmups" feature is designed to build and maintain a healthy sending reputation for your cold email outreach. Instead of sending a large volume of emails all at once, which can trigger spam filters, we gradually ramp up your sending volume. This gradual approach, combined with positive email interactions, helps boost your email deliverability rates.
2. We deploy high-deliverability IP servers specific to each campaign.
3. The ‘Warmup’ feature replicates humanized email sending patterns, spintax, and smart replies.
4. By establishing a positive sender reputation and gradually increasing the number of sent emails, Smartlead minimizes the risk of your emails being flagged as spam. This way, you can be confident that your messages will consistently land in the primary inbox, increasing the likelihood of engagement and successful communication with your recipients.
Can Smartlead help improve my email deliverability rates?
Yes, our cold emailing software is designed to significantly improve your email deliverability rates. It enhances email deliverability through AI-powered email warmups across providers, unique IP rotating for each campaign, and dynamic ESP matching.
Real-time AI learning refines strategies based on performance, optimizing deliverability without manual adjustments. Smartlead's advanced features and strategies are designed to improve email deliverability rates, making it a robust choice for enhancing cold email campaign success.
What features does Smartlead offer for cold email personalisation?
Smartlead enhances cold email personalisation through advanced AI-driven capabilities and strategic integrations. Partnered with Clay, The cold remaining software facilitates efficient lead list building, enrichment from over 50 data providers, and real-time scraping for precise targeting. Hyper-personalised cold emails crafted in Clay seamlessly integrate with Smartlead campaigns.
Moreover, Smartlead employs humanised, natural email interactions and smart replies to boost engagement and response rates. Additionally, the SmartAI Bot creates persona-specific, high-converting sales copy. Also you can create persona-specific, high-converting sales copy using SmartAI Bot. You can train the AI bot to achieve 100% categorisation accuracy, optimising engagement and conversion rates.
Can I integrate Smartlead with other tools I'm using?
Certainly, Smartlead cold email tool is designed for seamless integration with a wide range of tools and platforms. Smartlead offers integration with HubSpot, Salesforce, Pipedrive, Clay, Listkit, and more. You can leverage webhooks and APIs to integrate the tools you use. Try Now!
Is Smartlead suitable for both small businesses and large enterprises?
Smartlead accommodates both small businesses and large enterprises with flexible pricing and comprehensive features. The Basic Plan at $39/month suits small businesses and solopreneurs, offering 2000 active leads and 6000 monthly emails, alongside essential tools like unlimited email warm-up and detailed analytics.
Marketers and growing businesses benefit from the Pro Plan ($94/month), with 30000 active leads and 150000 monthly emails, plus a custom CRM and active support. Lead generation agencies and large enterprises can opt for the Custom Plan ($174/month), providing up to 12 million active lead credits and 60 million emails, with advanced CRM integration and customisation options.
What type of businesses sees the most success with Smartlead?
No, there are no limitations on the number of channels you can utilize with Smartlead. Our cold email tool offers a multi-channel infrastructure designed to be limitless, allowing you to reach potential customers through multiple avenues without constraints.
This flexibility empowers you to diversify your cold email outreach efforts, connect with your audience through various communication channels, and increase your chances of conversion. Whether email, social media, SMS, or other communication methods, Smartlead's multi-channel capabilities ensure you can choose the channels that best align with your outreach strategy and business goals. This way, you can engage with your prospects effectively and maximize the impact of your email outreach.
How can Smartlead integrate with my existing CRM and other tools?
Smartlead is the cold emailing tool that facilitates seamless integration with existing CRM systems and other tools through robust webhook and API infrastructure. This setup ensures real-time data synchronisation and automated processes without manual intervention. Integration platforms like Zapier, Make, and N8N enable effortless data exchange between Smartlead and various applications, supporting tasks such as lead information syncing and campaign status updates. Additionally, it offers native integrations with major CRM platforms like HubSpot, Salesforce, and Pipedrive, enhancing overall lead management capabilities and workflow efficiency. Try Now!
Do you provide me with lead sources?
No. Smartlead distinguishes itself from other cold email outreach software by focusing on limitless scalability and seamless integration. While many similar tools restrict your outreach capabilities, Smartlead offers a different approach.
Here's what makes us uniquely the best cold email software:
1. Unlimited Mailboxes: In contrast to platforms that limit mailbox usage, Smartlead provides unlimited mailboxes. This means you can expand your outreach without any arbitrary constraints.
2. Unique IP Servers: Smartlead offers unique IP servers for every campaign it sends out.
3. Sender Reputation Protection: Smartlead protects your sender reputation by auto-moving emails from spam folders to the primary inbox. This tool uses unique identifiers to cloak all warmup emails from being recognized by automation parsers.
4. Automated Warmup: Smartlead’s warmup functionality enhances your sender reputation and improves email deliverability by maintaining humanised email sending patterns and ramping up the sending volume.
How secure is my data with Smartlead?
Ensuring the security of your data is Smartlead's utmost priority. We implement robust encryption methods and stringent security measures to guarantee the continuous protection of your information. Your data's safety is paramount to us, and we are always dedicated to upholding the highest standards of security.
How can I get started with Smartlead?
Getting started with Smartlead is straightforward! Just head over to our sign-up page and follow our easy step-by-step guide. If you ever have any questions or need assistance, our round-the-clock support team is ready to help, standing by to provide you with any assistance you may require. Sign Up Now!
How can I reach the Smartlead team?
We're here to assist you! You can easily get in touch with our dedicated support team on chat. We strive to provide a response within 24 hours to address any inquiries or concerns you may have. You can also reach out to us at support@smartlead.ai